Title: Enhanced Osteogenic Differentiation of Stem Cells on Phase-Engineered Graphene Oxide Authors: Jia-Wei Yang, Kuan Yu Hsieh, Priyank V. Kumar, Sheng-Jen Cheng, You-Rong Lin, Yu-Chih Shen and Guan-Yu Chen* Abstract Graphene oxide (GO) has attracted significant interest as a template material for multiple applications due to its two-dimensional nature and established functionalization chemistries. However, for applications toward stem cell culture and differentiation, GO is often reduced to form reduced graphene oxide, resulting in a loss of oxygen content. Here, we induce a phase transformation in GO and demonstrate its benefits for enhanced stem cell culture and differentiation, while c

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